int main(int argc, char* argv[]){
    int a = 2, b = 1;
    const int *cp = &a;
    int *const pc = &a;

    *cp = 0;
    *pc = 0;
    cp = &b;
    pc = &b;

    int *p1 = nullptr;
    p1 = cp;
    p1 = pc;


    return 0;
}